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System Clock does NOT have the correct time? Try this...


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#1
perfect0

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I had an issue with my system clock wherein the time was almost always wrong at startup for either Windows XP or OSx86. Luckily, I found this after doing a google search. Maybe this will help others with the same issue:

The problem with the Windows clock being off is because the hardware clock (the one on your actual motherboard) is being set to "Universal" time, or GMT, when you shut down your MacOS bootup. When you boot Windows, Windows assumes your clock is set to your local timezone because that's what Windows does by default. This explains why the people who set their MacOS clock to GMT got the right time in Windows... If the hardware clock is being set to "GMT," when it's actually the local time, Windows will pick this setting up as local time as it did before.

To fix this, you need to add a key to your Windows system registry to tell Windows that your hardware clock will always be GMT.

*** WARNING: Editing your registry improperly can render your Windows installation inoperable. Proceed VERY carefully. I am not responsible if you mess something up. ***

The short solution for people who know how to edit the registry:
A DWORD key called HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation\RealTimeIsUniversal needs to have the value of "1"

The step-by-step solution is as follows:
1. Boot Windows

2. Click Start --> Run and type regedit. Click OK

3. The Windows Registry Editor should pop up. Navigate within the explorer to:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation

4. Click on the TimeZoneInformation "folder" from the navigation pane if you haven't already done so.

5. This assumes the correct key doesn't exist. If it does, you will just change the existing key's value: Right click on the white space within the folder (If you don't have a right mouse button, you may need to download a program called applemouse to emulate the "control-click" of the apple 1-button mouse). Select new --> DWORD Value. Title the key "RealTimeIsUniversal" (No quotes). Set the value to "1" (No quotes again). Hexidecimal should be fine.

6. Either reboot and set the clock in MacOS or set the clock in Windows. You should now be able to reboot into either OS and have a correct clock.


#2
MaFL

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Tnx!

#3
cbmkgd

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There is a couple of threads about this from a few months ago, with a few other solutions, including a script for windows. Search for "time zone" in forum search (including quotes).

The solution I used was to set an appropriate time zone in OSX, namely London (or "Ponta Delgada", depending if we're in daylight saving period). You have to change twice a year though.

#4
MaFL

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Thats what I used so far.
But in some forums/web services you have inaccurate times cause they read out your zone and calculate the time from their local.

Windows on Utc is imho the cleanest solution.

Edited by MaFL, 17 February 2007 - 02:18 AM.


#5
Korrupted

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The best way in my humble opinion is Apple's AppleTime.exe found in the Boot Camp drivers. All you have to do is stick it in your Start Menu's startup folder, and it'll fix it if necessary on boot. And it -does not- need EFI to work.

#6
cbmkgd

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in some forums/web services you have inaccurate times

ok, thanks for the heads up.

There's also a trick to use local time on osx (or rather to emulate it) in the wiki; haven't tested it yet, but it makes sense.

Also thanks Dax for the bootcamp thing. Didn't know about it since i didn't need bc.

#7
Neo-Keledai

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Hi all,

I'll try the first solution which is provided by the perfect0 (using REGEDIT way). At the first it was successfull then I use Windows XP mostly, but suddenly after around one hour, my clock revert back again into GMT which is -7 hours.

The weired things, if I do reboot to OSX, logon, restart/reboot logon into XP it will fixed again.... but after one hours, the clock would revert back into GMT -7. It is hassling to reboot every one hours, right? :)

Have anyone HAD same experience about this? And have anyone that use other way ( cbmkgd way) HAD same experience with me?


Thanks.

Regards,

Keledai

Edited by Neo-Keledai, 26 February 2007 - 09:29 AM.


#8
Jordan Ochocki

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I am also having the same issue. I've made the proper change in the registry to set Windows to use UTC, and it will work for roughly an hour, then revert to my local time, GMT -6.

Perhaps even more interesting is if I update the time, it still reverts after about an hour!

I'm interested with the AppleTime.exe file. Is it just included somewhere on the BootCamp image?

#9
SnowHow

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I had this clock problem also. What I did was deactivate the internet time sync in BOTH Windows XP and OS X. I set XP to the correct time zone (Central Time (-6 GMT)), and set "X" to London, England. Now both OS's show the correct time. This is much simpler than all these mods being discussed.

Edited by SnowHow, 03 March 2007 - 03:27 AM.


#10
Neo-Keledai

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I am also having the same issue. I've made the proper change in the registry to set Windows to use UTC, and it will work for roughly an hour, then revert to my local time, GMT -6.

Perhaps even more interesting is if I update the time, it still reverts after about an hour!

I'm interested with the AppleTime.exe file. Is it just included somewhere on the BootCamp image?



Jordan, I just change my Apple time zone into Zone that have same clock with my XP. For simple: in XP I use GMT + 7.00 which is Bangkok, Jakarta, Hanoi. And the time let say 5.00 PM

Then in Mac OS, I use GMT xxx which show the time clock same 5.00 PMi.e. Muscat

So instead I have same Time Zone, I go to same time clock.

I doesn't bother if my Mac OS zone doesn't reflect different with XP, as long as both show the same time.....

Thanks.

Regards,

Neo-Keledai

#11
graphic Design

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The best way in my humble opinion is Apple's AppleTime.exe found in the Boot Camp drivers. All you have to do is stick it in your Start Menu's startup folder, and it'll fix it if necessary on boot. And it -does not- need EFI to work.



DaxTsurugi, Could U please send me that file or show me the link where I can download it ?
Thanks in advanced!

#12
lord xeon

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wow, i always thought it was a problem with my vista install that was causing that to happen, glad to know its not, and that its fixable, i'll try this out tonight.

thanks

#13
Daimajin

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I think this might be what you're looking for. I downloaded it and gave it a few test runs. No matter what I set my time to, it always sets it back to the proper time/date. All I did was stick it in my startup folder.

Oh and many thanks to Neonkoala for directing my attention to this topic. Thanks!

Edit:

If the startup folder thing doesn't work, try the instructions at http://www.swmirror....upal/?q=node/32

They make the AppleTime file startup at a windows service.

Attached Files



#14
Hussey

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I recently done my MBA and now days I want to do some online Microsoft certifications and I Found this online notes is a best helping source to get online accurate information which is more helpful for my preparation.

#15
ArCaFeL

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Thx jaaaa :P

#16
SickAnimations

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Ha, I suspected this is what was going on. Thanks for confirming ;)

I actually changed OS X's time zone to GMT, since my Linux setup also assumes the system clock is set to my time zone.





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